Flexible compact AC transmission system - a new mode for large-capacity and long-distance power transmission

In this paper, the requirement and difficulties of large-capacity and long-distance power transmission under the background of national development strategy "transmission of electric power from the western to the eastern region" in China is analyzed. The compact transmission lines designed and constructed by China and FACTS technologies used to improve the power transmission stability and capacity in China are introduced. The preliminary study on the integrated technology predominance of compact transmission line and FACTS to enhance the transmission capability is carried out. Based on these investigations, the concept "flexible compact AC transmission system" is propounded. The inclusion and extension of this concept is analyzed: the complex and new questions of optimum-cooperating two technologies. Considering the long-distance transmission capability per unit corridor width, the flexible compact AC transmission system is a high efficient power transmission mode. It is applicable to EHV and UHV AC power transmission, and has a good developing and operating prospect.